Malicious PDF — malware analysis report

Static analysis result for SHA-256 be53409ff48aadff…

MALICIOUS

PDF

80.2 KB Created: 2021-05-03 22:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000923d95e2967dba09d36b24be95bfa SHA-1: 221cc667ca4c2908aca370f2e41bb587559f6aab SHA-256: be53409ff48aadff4c22fc162b2d8785b6112698a26bfb9608b557cad9d39e4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many pointing to Weebly-hosted PDFs with numeric slugs, suggesting a link farm or SEO spam operation. One of the primary URLs, 'https://zajinet.ru/strik?utm_term=william+faulkner+quotes+about+writing', indicates a potential lure disguised as content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=william+faulkner+quotes+about+writing
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/gamiferuwuneti_lefunutemega_fivizudaxojipog_jarofamev.pdf
    • https://cdn-cms.f-static.net/uploads/4487431/normal_60636a1b7db8c.pdf
    • https://dabagurujor.weebly.com/uploads/1/3/4/3/134350609/1713860.pdf
    • https://cdn-cms.f-static.net/uploads/4462075/normal_6054721eb79f1.pdf
    • https://pixogupegitof.weebly.com/uploads/1/3/4/5/134592450/bexobite-jizedozati.pdf
    • https://rekizutor.weebly.com/uploads/1/3/0/9/130969391/gerebotukakake.pdf
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/2588834.pdf
    • https://vizufawamowimo.weebly.com/uploads/1/3/4/7/134700475/fapinurun.pdf
    • https://cdn-cms.f-static.net/uploads/4413968/normal_6054f8b922e6b.pdf
    • https://cdn-cms.f-static.net/uploads/4460680/normal_6055c8e5680d0.pdf
    • https://xafudilolara.weebly.com/uploads/1/3/4/7/134744509/wadimeva.pdf
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/9177682.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_35e616f5a11e441388928bfd5c9947af.pdf?index=true
    • https://s3.amazonaws.com/fivebo/notation_guided_notes.pdf
    • https://s3.amazonaws.com/fibesezati/fewogi.pdf
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_8b92a8ba90984848845a36b281cba59c.pdf?index=true
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_e6af7791c2fd45d1a56a67cc2baa1869.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9b.bin
b52de7712fd8a136e1749a5dda7be469326b3a3d9cf658063b5b758ac4daa336
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 5404 bytes
font_01_sfnt_off000100ff.bin
f7b431a3a1840660387fd82d090c72e12a664adadb3d6979fbac6bf0e62e8962
pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 10692 bytes
font_02_sfnt_off0001254e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 4324 bytes